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3.2 - System architecture - controller addressing
The communication bus complies with standard RS 485.
The default communication speed is 9600 bauds. The maxi-
mum speed is 38400 bauds.
The maximum total bus length for the specified cable is
550 m. The communication protocol for the system bus is
the Carrier Comfort Network (CCN). The units are
connected along the length of a single bus cable that is
mounted in cascade between the units.
2
1
3
4
4 - INSTAllATION
4.1 - Installation instructions
IMPORTANT: For each power cable entering or leaving the
controller a maintenance and locking system is provided.
This maintenance system depends on the terminal unit
supplied with the controller. It is described in the selection
and installation documents for each terminal unit.
4.2 - Physical and electrical characteristics
Operating temperature:
Operating humidity:
Controller protection index:
Controller fixing on terminal unit: with a sheet metal
4.2.1 - Points to follow for the bus cable routing
•
The bend radius must be higher than 20 times the
cable diameter.
•
Avoid looping of the earth cable. Place the cable on
metallic structures.
•
The controller connection to the bus can be made
with a cable extension, if required. All extensions
must be as short as possible, and must never exceed
1.5 m.
EN-5
Sample architecture using several NTC controllers
1
1
3
5
0°C to 50°C
10 to 95% at 50°C (non-
condensing)
IP 20
screw, at the factory
Normal bus connection
Acceptable extension: max. 1.5 m
Controllers
IMPORTANT: Carrier recommends the use of the following
specific cable (or equivalent) the communication busses:
BELdEN cable 9842 (not supplied by Carrier)
128 controllers can be connected to the CCN bus.
The controller can accept up to 192 different addresses (1 to
192). The network address is configured using the Carrier
parameter tool. In an Aquasmart installation addressing is
automatic and done by the System Manager (refer to the
start-up manual).
1
3
6
A
•
Ensure that the earth potential is the same everywhere.
•
Connect one of the ends of the bus cable shielding
(only one) to the earth. The distance between the
shielding and earth must be as short as possible.
•
Ensure that the cable shielding continuity is guaranteed
along its whole length.
•
If the earth potential between the controllers is the
same, it is better to connect both ends of the bus cable
shielding to earth.
•
To avoid any reflection in long cables, it is recommended
to add an end-of-line impedance at one end of the bus.
The end-of-line impedance should be the same as the
characteristic nominal impedance for the selected cable
(120 ohms for the specified Belden cable). It will be
connected between the "+" and "-" terminals on the
last bus unit. It is important that the end-of-line
impedance and the characteristic cable impedance are
as similar as possible. If the network only has a short
distance, the end-of-line impedances can be left out
without effect on data transmissions.
•
It is important to connect the "+" and "-" terminals of
the bus cable on the same twisted cable pair.
1
legend
1
NTC controller
2
CCN communication bus
3
User interface connection
4
IR2
5
ZUI2
6
CRC2
A
Local A
B
B
Local B
En
EnGLiSH
EN-5
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